﻿// Copyright (c) 2014 Brent Bulla Jr.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#region

using System;
using System.Runtime.ConstrainedExecution;
using System.Runtime.InteropServices;
using System.Security.Permissions;
using Microsoft.Win32.SafeHandles;

#endregion

namespace Cinch.Utilities.FolderBrowserSupport
{
  [SecurityPermission(SecurityAction.Demand, UnmanagedCode = true)]
  internal class SafeModuleHandle : SafeHandle
  {
    public SafeModuleHandle()
      : base(IntPtr.Zero, true)
    {}

    public override bool IsInvalid
    {
      get { return handle == IntPtr.Zero; }
    }

    [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
    protected override bool ReleaseHandle()
    {
      return NativeMethods.FreeLibrary(handle);
    }
  }

  [SecurityPermission(SecurityAction.Demand, UnmanagedCode = true)]
  internal class ActivationContextSafeHandle : SafeHandleZeroOrMinusOneIsInvalid
  {
    public ActivationContextSafeHandle()
      : base(true)
    {}

    [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
    protected override bool ReleaseHandle()
    {
      NativeMethods.ReleaseActCtx(handle);
      return true;
    }
  }
}